Abstract:

A method for testing the cadmium in feed by microwave digestion-graphite furnace atomic absorption spectrometry was built. The amples were microwave-assisted digested by nitric acid and hydrogen peroxide, and determinated by graphite furnace atomic absorption spectrometer. The working curves of cadmium were linear in the range of 1.0～10.0 ng/mL. The results show that there is no significant difference among the three digestion methods of microwave digestion, wet digestion and dry-ash, the coefficients of recovery is 77.5%, 79.0% and 80.5%, respectively. The method has the characteristics of simplicity and speedness.

Key words: micrewave digestion, graphite furnace atomic absorption spectrometry, cadmium, feed

摘要：

建立了微波消解-石墨炉原子吸收分光光度法测定饲料中镉的方法。样品用硝酸和过氧化氢进行微波消解,用石墨炉原子吸收分光光度计测定。镉在1.0~10.0 ng/mL浓度范围内有良好的线性关系,相关系数R=0.999 7。实验结果表明微波消解与湿法消解、干灰化消解法测定结果无显著差异,回收率分别为77.5％、79.0％和80.5％。该方法简便、快速,能大大减少样品处理时间,提高工作效率。

关键词: 微波消解;石墨炉原子吸收分光光度法;镉;饲料